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      1 import os
      2 from autotest_lib.client.bin import test, utils
      3 
      4 
      5 class hackbench(test.test):
      6     """
      7     This module will run the hackbench benchmark. Hackbench is a benchmark for
      8     measuring the performance, overhead and scalability of the Linux scheduler.
      9     The C program was pick from Ingo Molnar's page.
     10 
     11     @author: Nikhil Rao (ncrao (at] google.com)
     12     @see: http://people.redhat.com/~mingo/cfs-scheduler/tools/hackbench.c
     13     """
     14     version = 1
     15     preserve_srcdir = True
     16 
     17 
     18     def setup(self):
     19         os.chdir(self.srcdir)
     20         if 'CC' in os.environ:
     21             cc = '$CC'
     22         else:
     23             cc = 'cc'
     24         utils.system('%s -lpthread hackbench.c -o hackbench' % cc)
     25 
     26 
     27     def initialize(self):
     28         self.job.require_gcc()
     29         self.results = None
     30 
     31 
     32     def run_once(self, num_groups=90):
     33         """
     34         Run hackbench, store the output in raw output files per iteration and
     35         also in the results list attribute.
     36 
     37         @param num_groups: Number of children processes hackbench will spawn.
     38         """
     39         hackbench_bin = os.path.join(self.srcdir, 'hackbench')
     40         cmd = '%s %s' % (hackbench_bin, num_groups)
     41         raw_output = utils.system_output(cmd, retain_output=True)
     42         self.results = raw_output
     43 
     44         path = os.path.join(self.resultsdir, 'raw_output_%s' % self.iteration)
     45         utils.open_write_close(path, raw_output)
     46 
     47 
     48     def postprocess_iteration(self):
     49         """
     50         Pick up the results attribute and write it in the performance keyval.
     51         """
     52         lines = self.results.split('\n')
     53         for line in lines:
     54             if line.startswith('Time:'):
     55                 time_val = line.split()[1]
     56                 self.write_perf_keyval({'time': time_val})
     57